compare() [1/13]

template<typename char_t , typename traits_t , typename allocator_t >

int32 xtd::basic_string< char_t, traits_t, allocator_t >::compare ( const basic_string< char_t, traits_t, allocator_t > &  str ) const

inline

Compares two character sequences.

Parameters

str	The other string to compare to.

Returns

• Negative value if *this appears before the character sequence specified by the arguments, in lexicographical order.
• Zero if both character sequences compare equivalent.
• Positive value if *this appears after the character sequence specified by the arguments, in lexicographical order.

Remarks

Compares this string to str.

A character sequence consisting of count1 characters starting at data1 is compared to a character sequence consisting of count2 characters starting at data2 as follows:

• First, calculate the number of characters to compare, as if by size_type rlen = std::min(count1, count2).
• Then compare the sequences by calling traits_t::compare(data1, data2, rlen). For standard strings this function performs character-by-character lexicographical comparison. If the result is zero (the character sequences are equal so far), then their sizes are compared as follows:

Condition	Result	Return value
traits_t::compare(data1, data2, rlen) < 0	data1 is less than data2	< 0
traits_t::compare(data1, data2, rlen) == 0 and size1 < size2	data1 is less than data2	< 0
traits_t::compare(data1, data2, rlen) == 0 and size1 == size2	data1 is equal to data2	0
traits_t::compare(data1, data2, rlen) == 0 and size1 > size2	data1 is greater than data2	> 0
traits_t::compare(data1, data2, rlen) > 0	data1 is greater than data2	> 0